fix(forms): fixed a directive selector

Author: vsavkin

modules/angular2/src/forms/directives.js

@@ -32,8 +32,7 @@ export class DefaultValueAccessor {
 }
 
 @Decorator({
- selector: 'input[type=checkbox]', //should be input[type=checkbox][control]
- // change the selector once https://github.com/angular/angular/issues/1025 is fixed
+ selector: 'input[type=checkbox][control]',
  events: {
  'change' : 'onChange($event.target.checked)'
  }